The cool thing about military vehicles is that they don't comply to the 'gotta have the new model' planned obsolescence of passenger vehicles. If something works, it stays in service.

Take the deuce and a half. It was designed as an REO back in 1949 and saw its first service in '51. You can still find them working for the US Army as the M35.

Surely, though, there's an older military vehicle (land, sea, or air) that's still in service somewhere. What do you think it is?

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